US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
340 PM EDT Wed Jun 19 2019
 
Valid Saturday June 22 2019 - Wednesday June 26 2019
 
Hazards:
- Heavy rain across portions of the Central and Southern Plains, the Mid and Upper Mississippi 
Valley, the Great Lakes, and into the Ohio Valley, Sat-Sun, Jun 22-Jun 23.
- Heavy rain across portions of the Lower Mississippi Valley and the Southern Plains, Mon-Tue, Jun 
24-Jun 25.
- Flooding possible across portions of the Central and Southern Plains, the Middle Mississippi 
Valley, and the Ohio Valley.
- Flooding occurring or imminent across portions of the Central Plains, the Lower and Middle 
Mississippi Valley, the Ohio Valley, and the Tennessee Valley.
- Flooding likely across portions of the Central Great Basin and the Ohio Valley.
- Excessive heat across portions of southern Texas, Sat-Mon, Jun 22-Jun 24.
- Much below normal temperatures across portions of the High Plains, the northern and central 
Rockies, and into much of the Great Basin, Sat-Sun, Jun 22-Jun 23.
 
Detailed Summary:

Another cold and deep upper low over the northwestern U.S. is forecast to move off the northern 
Rockies and lift into south-central Canada during the weekend. Global models continue to indicate 
the possibility of residual snow over the higher elevations of Montana and northwestern Wyoming 
Saturday morning. Temperatures will be much colder than normal from the Great Basin to the central 
and northern Rockies through the weekend, where morning low temperatures are forecast to dip below 
freezing at some locations.

As the upper-level low lifts into Canada during the weekend, heavy rain will likely spread from the 
central Plains northeastward across the upper Midwest into the Great Lakes ahead of a warm front. 
Farther west, model guidance is indicating that a second piece of energy in the wake of the 
departing upper low will amplify over the central Rockies as the amplifying upper low interacts 
with a cold front during the weekend. Snow is a possibility over the higher elevations of the Great 
Basin on Saturday, shifting eastward into the central Rockies on Sunday when a low pressure system 
is forecast to intensify over the central High Plains. There is the possibility of heavy rain ahead 
of this low over portions of the southern Plains early next week. It appears that the heavy rain 
threat over the Plains will decrease by the middle of next week as the main low pressure system 
lifts into the Great Lakes and southeastern Canada while a high pressure ridge begins to build into 
the Southeast.

Meanwhile, summer heat from the Deep South is expected to spread northeastward into the 
Mid-Atlantic by early next week. Heat indices are forecast to reach 110 degrees across the Rio 
Grande Valley of southern Texas each day. As the hot and humid air spreads northeastward, afternoon 
heat indices are expected to reach 105 degrees from portions of the Florida Panhandle to along the 
coastal plains of the Southeast through the middle of next week.

No hazardous weather is anticipated for Alaska through the medium-range period.

Kong